linux-kernel - [PATCH] ipc: fix compat msgrcv with negative msgtyp

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Message-Id: <1389793932-7549-1-git-send-email-mguzik@redhat.com>
Date:	Wed, 15 Jan 2014 14:52:12 +0100
From:	Mateusz Guzik <mguzik@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Gabriellla Schmidt <gsc@...ker.de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH] ipc: fix compat msgrcv with negative msgtyp

Compat function takes msgtyp argument as u32 and passes it down to
do_msgrcv which results in casting to long, thus the sign is lost
and we get a big positive number instead.

Cast the argument to signed type before passing it down.

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
Reported-by: Gabriellla Schmidt <gsc@...ker.de>
Cc: Al Viro <viro@...iv.linux.org.uk>
---
 ipc/compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ipc/compat.c b/ipc/compat.c
index 892f658..d3b3760 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -381,7 +381,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
 			uptr = compat_ptr(ipck.msgp);
 			fifth = ipck.msgtyp;
 		}
-		return do_msgrcv(first, uptr, second, fifth, third,
+		return do_msgrcv(first, uptr, second, (s32)fifth, third,
 				 compat_do_msg_fill);
 	}
 	case MSGGET:
-- 
1.8.3.1

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